Cancellation request message

With the Push
Plus level of service, you can try to cancel a push message that you sent to all PINs
or tokens, or to a subset of PINs or tokens. A BlackBerry device
must be out of coverage range for at least ten minutes before you can successfully
cancel a push message to the subscriber. Cancel requests are included with the Push
Plus level of service. They are not available with the Push
Essentials level of service.